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Finding the Fourth Proportional to 865.19, 1,294.61 and 818.28

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Solution

The fourth proportional to 865.19, 1,294.61 and 818.28 is: 1,224.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.19 : 1,294.61 = 818.28 : x
  2. Step 2: Convert to fraction form
    865.19/1,294.61 = 818.28/x
  3. Step 3: Cross multiply
    865.19x = 1,294.61 × 818.28
  4. Step 4: Simplify right side
    865.19x = 1,059,349.38
  5. Step 5: Solve for x
    x = 1,059,349.38/865.19
  6. Step 6: Final answer
    x = 1,224.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.